when to use while loop rather than for loop

Question

I am learning java as well android. Almost everything that we can perform by while loop those things we can do in for loop.

I found a simple condition where using w

Answer 1

Use a FOR loop when you know the number of times you want to loop. The technical term for that is the number of iterations. How do you know the number of iterations? You know the start, stop and step. If you know those three pieces of information, you should use a FOR loop because it's the right tool for the job.
Use a DO loop when you don't know the number of iterations. If you don't know the start, stop, step or some combination of those then you need to use a DO loop. The expression will be evaluated at the top of the loop. Use a DO WHILE loop if you want to loop at least once. Use just a WHILE loop if you don't want to loop at least once. The expression will be evaluated at the bottom of the loop.